1972 evinrude 125 Ignition

[oldglastron]

Hi,
I have a 1972 evinrude 125 Hydro-electric shift outboard, I got it seperate from my boat I am trying to wire in the controls, they were cut when I got them. I ordered a new ignition switch from OMC P/N 0386947 it replace my old unit P/N 383493. The problem I am having is I think my new $50 switch may be defective? I checked continuity while holding the switch in the start position I probed the "B" terminal and the "S" terminal and have no continuity the only one that does is the "A" terminal. the "A" terminal does have continuity in the key-on position also no other terminals ever have power. is there a electric shift issue or is the switch fualty?
I really liked all the FAQS I read all the hydro-electricshift posts I could find before posting this I do have a book but it is only a Clymer. I am using a FLuke tester. thankyou,
James

 

[jonesg]

Re: 1972 evinrude 125 Ignition

Absolutely no idea but I bought a harness , the switch came with cut wires still installed with 4 inches of wire left on it.

Using the factory manual I just matched everything up, I left the wires on the switch as reference and installed plugs (in case I got it wrong).

anyway...bump...

 

[jay_merrill]

Re: 1972 evinrude 125 Ignition

You may be overthinking this - why not just hook it up and see if it works?

 

[oldglastron]

Re: 1972 evinrude 125 Ignition

Sorry I forgot the part that I already hooked it up and nothing happend I have no power to the start position,only to the ignition position. I went to the auto parts store and picked up a generis switch and it worked. I will not be using it permenently. I am ordering another switch maybe this one will work. I still have no power to the ignition parts so I will be working on that today if anyone has a better wiring diagram from a actual service manual I would greatly appreciate a pic. My manual is not very good. my engine is a 125283R 1972 Hydro-electric shift with CDI thanks again.

 

[jay_merrill]

Re: 1972 evinrude 125 Ignition

If you hooked it up and the start circuit would not engage, its probably because the neutral cutout switch in the control unit was not in the proper position, or is bad. I'm not sure what the inside of the ERude control box looks like because my motor is a Johnson, but the white wire that comes off of your "S" terminal should lead into the shift switches in your box. At that point, it should connect to a switch and then continue on, through your wiring harness, to the starter solenoid.

Try hooking it back up again and then use your multimeter to check for voltage at the S terminal with the key in the start position. If you get voltage, you probably have a bad neutral cutout switch, a short in the wiring harness, or a bad solenoid. At this point, I think I would check continuity of the start circuit in the wiring harness from the control box to the plug, and from the plug in the motor to the solenoid. If those both check OK, I would then disconnect the white wire at the "S" terminal, and the starter solenoid, followed by running a long piece of wire directly from the "S" terminal to the appropriate post on the solenoid. If, at that point, turning the key to the start position engages the starter, you can be pretty sure that the problem is in the neutral cutout switch.

I don't have a wiring diagram for your motor, but I do have one for a 1972 Johnson 65hp. My guess is that the start circuitry is the same. If you think that would help. PM me with an email address and I'll send it to you.

 

[oldglastron]

Re: 1972 evinrude 125 Ignition

Jay,
thanks for the help, my control box is in pieces which is the way I got it. I was guessing there was some sort of nuetral switch somewhere it must have been removed at some point. I have already jumped the white wire to the solenoid and it turns over I used the other switch and all works fine. I am pretty sure my OMC switch has a bad contact at the S position. I will be adding a new saftey switch and a new temp saftey switch as it is missing and grounded to the block. Now I am on to the no spark issue.
thankyou for the help

 

[jay_merrill]

Re: 1972 evinrude 125 Ignition

Sounds good.

Once you replace the start switch that you bought, you can check the rest of the system. BTW, one of the things that I forgot to mention in my previous posts, is that the replacement switch for the Hydro-electric boxes has one more lead than the original. It is there merely as a convenience, and is actually part of the one next to it. I can't remember off the top of my head which post is duplicated, but I am thinking it is the one with all the purple wires attached. All it does is to give you an extra place to attach some of the wires, so that you don't have to try to "cram" them all on one post.

On the Johnson version, the neutral cutout switch is built into the shift switch. While I am not certain that is true on the ERude version, there is a "Ignition to Shift Switch Lead" (Part #581002) shown on the 1972 parts explosion for your motor. That would lead me to believe that the neutral cutout is built into the neutral push button switch. If you still have a problem after replacing the key switch, and you think it is the cutout, you may have a problem finding a repacement for the Selector Switch Assembly (Part #279458). But, if the shift portion of the neutral switch still works, you can just wire the neutral cutout circuit to a guarded toggle switch.

Here's a site that may be of some help in all of this:

http://shop2.evinrude.com/ext/index.aspx?s1=3de1832559a81e8a8b1198726d3a1504

 

[oldglastron]

Re: 1972 evinrude 125 Ignition

Jay,
once again thankyou, I think its going to be a boat anchor rather than a engine the pulse pack is bad $288 coil $30ish and one of the prongs to the coil lead is broke off the distributor $200. I don't think its worth it the power head and lower unit are good but thats about it I borrowed a CDI tester from a friend at powersports shop that pluged into my fluke meter and did several of the tests including the light bulb test that I found here in this wonderfull forum, great info and not hard to find. I will be looking for another engine now maybe an 85hp V-4 80ish. thankyou.

 

[jay_merrill]

Re: 1972 evinrude 125 Ignition

Sorry to hear that! I like the old OMC motors but it is true that sometimes you get to a point where you feel like you are building a whole new motor from scratch!

 

[miguelorozco2002]

Re: 1972 evinrude 125 Ignition

if not to much to ask can you send me a copy of the diagram for the ignition switch, i have a 65 johnson currently no spark dont know what the problem is, boat was running and then it just stopped dead no spark after that.